Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1983-07-13
1986-02-18
Tarcza, Thomas H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 7A, G01S 1300
Patent
active
045715904
ABSTRACT:
A system for adaptively adjusting a radar's receiver attenuation of input signals having a wide dynamic range to maintain the attenuated signals within a predetermined range for radar post processing operations is disclosed. The system includes an automatic gain control (AGC) loop governed by a computed logarithmic signal representative of the measured clutter content of the input signals received over the time interval of a radar look and a compatible reference logarithmic signal to generate a logarithmic adjustment signal for the receiver attenuation. The AGC loop includes selectable loop gains which are selected as a function of the computed logarithmic signal. More specifically, one set of loop gains is selected when the computed logarithmic signal is equal to or greater than a threshold level, and another set of loop gains is selected when the computed logarithmic signal is less than the threshold level. The AGC loop may further include an accumulator for accumulating signals based on the logarithmic signals computed over a succession of radar looks, and apparatus for rendering the AGC loop unresponsive to the computed logarithmic signals for a period of time and for causing the accumulator to converge to a desired level during the time period. The AGC loop may further include a limiter for limiting the logarithmic adjustment signal to within a predetermined signal range.
REFERENCES:
patent: 3786506 (1974-01-01), Effinger et al.
patent: 4058809 (1977-11-01), Chudleigh, Jr.
patent: 4263560 (1981-04-01), Ricker
patent: 4509050 (1985-04-01), Amoroso, Jr. et al.
Hellner Mark
Tarcza Thomas H.
Westinghouse Electric Corp.
Zitelli W. E.
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